Grandma: Most people your age have a family and are married. Why aren’t you?
Grandchild: Most your age are dead. Why aren’t you?
Grandma: Most people your age have a family and are married. Why aren’t you?
Grandchild: Most your age are dead. Why aren’t you?
Listen up, genius! You see, the grandma is questioning the grandchild's life choices, specifically their lack of marriage and family. The grandchild then throws it back at her by pointing out that most people her age are dead, implying she should be too. It's funny because it's an unexpected and kinda savage comeback, see?